Protect everything and everyone that is most important to you with this integrated 120 V AC wire-in smoke alarm with 10-year sealed battery backup. It has an LED strobe light that provides temporal patterns, as well as visual and voice warnings. A voice calls out danger. It is also equipped with a 177 candela strobe light (powered by Cree LEDs), designed to notify the deaf and hard of hearing and meets Visual Signaling Requirement for Ontario Building Code. The unique design measures only 5.8 cm (2.3") in height, when mounted yet it is still cUL listed.